I'm guessing since the floor is usually not missing, I should insulate this spot while I have the chance. What's an appropriate material to put in this area? Bonus: I'm pretty sure moisture sometimes makes its way in here.

I'd be inclined to put some kind of waterproof membrane down. I'm not really sure that insulating this area would be terribly effective though, as the air is probalbly quite still, and the insulative property of the brick is quite good.posted by singingfish at 11:48 PM on November 10, 2011

Seconding. Any time you spend on this is worth more than the incredibly small amount of savings you'll see on your energy bill.posted by pjaust at 5:35 AM on November 11, 2011

You want some kind of flashing on the outside to keep the water out, and then some expanding foam on the inside. I would probably use minimally expanding foam so you don't accidentally push anything out of whack.posted by gjc at 9:16 AM on November 11, 2011

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